Ophthalmic mounting.



N. M. BAKER & H. K. PARSONS.

OPHTHALMIC MOUNTING.

APPLICATION FILED FEB. 23. 1915.

1,245,998. Patent ed Nov. 6, 1917.

WITNESSES.

rron/m5 *nNrrn A err NELSoN M. BAKER AND AROLDE P RSONS; o 'sou'rnBEInGE, MASSACHUSETTS. v

Application filed February 23, 1915. Serial N6. 9,850.-

To all whom it may concern: I

Be it known that we, NELsoN M. BAKER and HAROLD K PARSONS, citizens of the United fitates, residing at, Southbridge, in the countyof Worcester andState of Massa; chusetts, have invented certainnew and use ful I Improvements in Ophthalmic Mountf ings, .of which the'following is a specification. I i

This invention relates to ophthalmic mountings, and has particular reference to that type of mounting embodying spring actuated nose engaging members whichis commonly termed a finger-piece mounting. The leadingobject of the present inven tion is the provision of an improved mounting of this character which will permit of the use of relatively large lenses andwill attain what is commonly termed a shorter narrow P. D., or in other words; in which a minimum separation of the proximate edges of the lenses will bercquired for accommodation of the partsof the mounting.

A further object of the present invention is the provision ofan 'improved construc tion of guard lever arm which shall greatly facilitate the formation of the pivot bearing, while aidingin the attainmentof the narrow P. D. of themounting.

Other objects of the present invention include simplification of the various parts of the mounting and adaptations of the struce ture thereof, all working toward theattainment of the narrowest possible D. for the mounting, and said objects and advantages should be readily apparent by, reference to the following description taken in connection with the accompanying drawings, and it will .be understood that we may make any modifications in therspecific details of construction shown and described within the scope of the appended claims without departing from or exceeding the spirit of this invention. I p 4 Figure I representsa fragmentary view slightly in perspective of 3 an opthal'mic mounting embodying-our invention.

Fig. II represents a top plan view thereof. FigLIII represents a plan view of one form of lever arm blank. Fig. IV represents a similar view of nother view thereof. v

Fig. V represents asimilar view of a further modification.

"Specification of Letters Patent.

Patented Novr 6519i? Fig; VI represents a plan view'of a guard arm formed from' the blank shown in Fig. III.

Fig. VII represents a fragmentary per spective view of one form of bridge and lens attachment.

Fig' VIII represents a iperspectivevie w of' h Part3 a Orieiside il t mo nting ini'poion for assembling, 1 i 1 =3 Fig. 1X represents rmgiaent ry'rrq it elevation of an extremely narrow P, D; ea me"- a F1g.' X"repr-esents a plan view thereof,

Fig; XI represents anfed'ge iewern e parts the bridge being' sliown in sectionn' In the drawings, inwliich similar" char acters' of reference are femployeld to denote corresponding parts throughout the several views, the numeral 1 designatesthelenSeS which are connected bythe bridgefmember 2 bearing atits end the lens 'clip's or attachments [3. In certain of the "forms of the drawingsjwe have shown the elip. 3'las having ears embracing the sides' fthe lens connectedbya screw, ,or-o'ther'fastening deare connectedwi'thout the use ofm'echanie l fastening devices:

It willbenoted that'in the attainment r the narrowiP. D. of ourmountingthe bridge I 2 is preferably so shaped as'to-ffiit the crest' of th nose of the wearerl'andfi's attached substantially to the front of the clip so that the inner edge of the d1ip fnrm a continuation of the' inner fac'eo'f the bridge arch and is adapted :to rest upontheumse and form a guard or bearing 'n'iemberj It. Wlll thus be seeni'thjat the lenses are brought substantially into engagement with the nose, being separated therefrom at ;the

most. merely byithe thickness of the strap portion of the lens clip. 'o seq enuma much larger lens 'may he employed thanis p possible with the at present common type's of mountings in which the seat for the guard arm pivot is located intermediate the inner curve of the bridge and the edge of the lens.

In our construction to accommodate :the

pivot 4 for the lever arm, we dispose the pivot seat or lug-5 either forwardly or rear- .wardly of the lens attachment, and laterally 'out of the curve of the arch offthe It will be understood, however that as illus trated in Fig. XI for example, the seat 5 in place of being substantially in alinement with the terminus of the bridge, may be disposed somewhat thereabove along the lens clip and at any desired position where the correct movement of the lever arm may be obtained. The main essential is that the pivot seat and pivot will be so disposed that it will in nowise interfere with the bringing in of the edges of the lenses toward the sides of the nose.

To obtain maximum travel of the guard in minimum space it is necessary that the material of the lever arm be disposed in a vertical in contradistinction to the horizontal plane usually occupied by said material. It is, therefore, necessary that some satisfactory pivot bearing be provided. In the ordinary types of construction this pivot bearing isprovided by merely piercing the material of the lever arm. In the present form of construction, however, this is an impossibility, and the most desirable method is to in somewise form a tube with its axis parallel to the plane of the arm through which the pivot 4 may pass.

One of the main improvements of our present invention resides in the formation of this tube.

Figs. III, IV, and V illustrate three of the possible forms of blanks for obtaining the same result in the same manner. In each of these we have shown the blank as comprising the guard 6 at one end and the handle 7 at the other end, the .arm prefer ably having the loop 8 formed intermediately therein to facilitate swinging ofthe arm in position, while intermediately along the arm is the extension or finger 9 adapted to bedoubled, as indicated in Fig. VI, or to be bent downward at the oifset 10, in the case of the form shown in Fig. IV, whereby this finger is brought to extend along one of the other portions of the lever arm. The material of the lever arm and the material of the finger are then each formed with the semi-cylindrical depression 11, as indicated in Figs. VI and VIII for example, the two depressions together providing the cylindrical aperture 12 to receive the pivot 4.

It will thus be seen that if desired the pivot bearing may be entirely formed simply by bending of the material without the use of solder or the like, or at the most it is merely necessary to solder the terminus of the finger 9 to the main portion of the lever arm, and that consequently a very satisfactory while inexpensive construction is provided.

Particular attention is invited to the structure illustrated in Figs. IX to XI, inclusive, in which it will be noted that the lens 1 has formed therein a slight recess as at 13, and

vside the field of vision.

is additionally edged at a bevel or angle in place of fiat edge as is customary. This type of construction is particularly adapted in connection with a thin cement strap lens attachment or the like which engages but a slight portion of the edge practically out- In this construction, as should be readily apparent by ref erence to Figs. X and XI particularly, the depth of the recess-l3 is just sufficient to receive the lens attachment so that the bridge proceeds directly forwardly from the lens and the inner curve of the bridge is in alinement with the inner beveled curve of the lens, the lens thus being brought into actual engagement with the nose if so desired, while the width of the portion of the clip resting on the faces of the lens is so slight that the same would not be noticed by the wearer of the mounting, Consequently the mounting in nowise interferes with the vision. In this form of construction we have shown the pivot seat 5 as carried near the upper portion of the lens clip, the loop 8 in the lever arm curving upward along the edge of the lens in about the position indicated in Fig. IX for example, so that any required amount of movement maybe given the guard arm without the same being brought into disagreeable contact with the sides of the nose. The mounting just described is particularly desirable when properly fitted, since if the correct size and shape of bridge is employed the bridge, lenses and lens attachments may be all brought to fit against the nose and provide steadying rests or bearings to insure exact correct positioning of the lenses before the eyes, while the guard member 6 serves merely as a gripping member to engage the nose to prevent tilting of the mounting thereon, much in the manner of operation of the temples in the ordinary spectacle mounting.

We claim:

1. A guard lever arm for a mounting of the character described, comprising a main arm having an olfset, a supplemental finger formed integral with the offset, the said finger being doubled upon thearm and the arm and finger being shaped to form a tubular portion or pivot bearing substantially as and for the purpose described.

2. A guard lever arm for a mounting of the character described, comprising a main arm having an offset, said oifset terminating at one end into a handle and the other end into a finger'extending parallel with one portion of the arm, the said finger being doubled upon the handle portion of the arm and the finger and arm being shaped to form a pivot bearing.

8. A guard lever arm for a mounting. of the character described, comprising a main arm and a supplemental finger integral therewith, the said finger being doubled upon j acent thereto being spread to form a tubuthe arm and the arm and finger being shaped lar bearing, substantially as described.

to form a tubular portion or pivot bearing, In testimony whereof We afiix our signasubstantially as and for the purpose detures in presence of two Witnesses.

5 scribed.

- 1 NELSON M. BAKER. 4. A guard arm for a fingerplece mounting, comprising a main portion and a finger HAROLD PARSONS bent to extend along the main portion and Witnesses: having its end secured to the main portion, STUART W. CADY,

10 the said finger and portion of the arm ad- CARROLL BAILEY.

Copies of this patent may be obtained for five cents each, by addressing the commissionerof Patents,

' Washington, D. G. 

